/*
*   $Id$
*
*   Copyright (c) 2000-2002, Darren Hiebert
*
*   This source code is released for free distribution under the terms of the
*   GNU General Public License.
*
*   This module contains functions for generating tags for scripts for the
*   Bourne shell (and its derivatives, the Korn and Z shells).
*/

/*
*   INCLUDE FILES
*/
#include "general.h"	/* must always come first */

#include <string.h>

#include "parse.h"
#include "read.h"
#include "main.h"
#include "vstring.h"

/*
*   DATA DEFINITIONS
*/
typedef enum {
    K_FUNCTION
} shKind;

static kindOption ShKinds [] = {
    { TRUE, 'f', "function", "functions"}
};

/*
*   FUNCTION DEFINITIONS
*/

/*  Reject any tag "main" from a file named "configure". These appear in
 *  here-documents in GNU autoconf scripts and will add a haystack to the
 *  needle.
 */
static boolean hackReject (const vString* const tagName)
{
    const char *const scriptName = baseFilename (vStringValue (File.name));
    boolean result = (boolean) (strcmp (scriptName, "configure") == 0  &&
			       strcmp (vStringValue (tagName), "main") == 0);
    return result;
}

static void findShTags (void)
{
    vString *name = vStringNew ();
    const unsigned char *line;

    while ((line = fileReadLine ()) != NULL)
    {
	const unsigned char* cp = line;
	boolean functionFound = FALSE;

	if (line [0] == '#')
	    continue;

	while (isspace (*cp))
	    cp++;
	if (strncmp ((const char*) cp, "function", (size_t) 8) == 0  &&
	    isspace ((int) cp [8]))
	{
	    functionFound = TRUE;
	    cp += 8;
	    if (! isspace ((int) *cp))
		continue;
	    while (isspace ((int) *cp))
		++cp;
	}
	if (! (isalnum ((int) *cp) || *cp == '_'))
	    continue;
	while (isalnum ((int) *cp)  ||  *cp == '_')
	{
	    vStringPut (name, (int) *cp);
	    ++cp;
	}
	vStringTerminate (name);
	while (isspace ((int) *cp))
	    ++cp;
	if (*cp++ == '(')
	{
	    while (isspace ((int) *cp))
		++cp;
	    if (*cp == ')'  && ! hackReject (name))
		functionFound = TRUE;
	}
	if (functionFound)
	    makeSimpleTag (name, ShKinds, K_FUNCTION);
	vStringClear (name);
    }
    vStringDelete (name);
}

extern parserDefinition* ShParser (void)
{
    static const char *const extensions [] = {
	"sh", "SH", "bsh", "bash", "ksh", "zsh", NULL
    };
    parserDefinition* def = parserNew ("Sh");
    def->kinds      = ShKinds;
    def->kindCount  = KIND_COUNT (ShKinds);
    def->extensions = extensions;
    def->parser     = findShTags;
    return def;
}

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